Hoisting mechanism



F. F. sr-:AMAN 1,802,091

HoIsTING MECHANISM Filed July 15. 1929 2 Sheets-Sheet 1 April 21, 1931..

ATTORN EYS Patented Apr. 21, 1931 f UNITED sfrfriszws` OFFI'CE., ii

FRANK F. sEaMAN, oF SPRINGFIELD, oIIIo, AssIGNoF. To RoBBINs'aMY'FRs,INC., oF f SPRINGFIELD, oIIIo, A CORPORATION oF oHIoIIoIsTING'MFGIIANIsM i' y' Application ined Jury 15, 1929. serial No.378,263.

This invention relatesto'hoisting mechanism, it more particularlyrelating to mechanism of this character which employs an electricallydriven power drum mounted in a frame supported above the load, togetherwith a cable having its dead end anchored to' the frame and the other tothe drum, and a load hook block carried by the cable.

.A diiiiculty encountered in this class of hoisting mechanism resides inthe fact ythat the swaying motion of thel hook block as it ascends Vwiththe load sometimes causes it to strike and catch some portion of theframe, prior to the contact withrthe automatic stopping mechanism forthe motor, resulting in damage to the mechanism.

One of the objects of the invention is yto obviate the danger ofbreakage from'this source by so constructing the'frame and block as tocause the blockton freely pass the frame parts and be guided intocontact withthe automatic stopping devices.

i A further object of the invention is-to provide a guide 'for thecableat a point adjacent the drum at times when the cable is dragging aload from a lateral position.

Another source of annoyance in rconnection with hoists of this type isthe tendency of the coils of cable to climbl onthe drum, particularlydurin fthe latter part ofthe winding operation, ue tothe increasingangle assumed by that part of the cable which is being wound resultingfrom the practice of anchorl ing the dead end of the cable at a point inline with the midway plane of the drum. While with this method otanchoring the two or more strands of the cable stand at but a. slightangle to the drum at the beginning of the hoisting operation, yet thisangle from the midway point constantly increases until during the laterpart thereof, the angle is considerable and frequently results in thecoils of the cable climbing one upon another instead of following thegroove of the drum.

Another object of the invention is to overcome this difficulty by soanchoringthe dead end of the cable that the angle of that portion of thecable being wound on the drum decreases as the load ascends, until nearthe end of the hoisting operation that portion of` the cable stands atavery the axis'of the drum andin fact at one point perpendicular to thedrum. In the accompanying drawings:

(Fig. 1 is a front elevation o a hoisting device embodying myimprovements. p y

Fig. 2 is a vertical section throughthe hook block, the section being onthe line Q-Qof Fig. 1. Y p n A Fig. 3 is a top plan view of the hookblock.'l Fig. 4 isa side elevation with the frame parts broken awayand-shown in longitudinal section. A f Fig. 5 is a top plan view withthe frame parts broken away' and shown in transverse section.k Y i Theframe which supports the winding drum and its motor is indicated at 1,'this slight angle to fra-me being inthe nature of an enclosing o.

structure `which has a vertical longitudinally extending wall 2 and apair of vertical transversely extending walls 3 which are apertured toreceive the side flanges of the winding drum 4. The'frame is connectedtorand The winding drum is suitably mounted in the frame and is. gearedkto an electric motor 8 also carried by the frame,y the vgearing (notshown) being of any well known speed reduction type mounted in the gearJcasing 9.

. The underside of the frame is provided with aV square openingl toaccommodate the cable and hook block, the walls of this open-v ingbeingv provided with ka depending outwardly fiared iiange 10 :for the'Apurpose to be explained.

rIfhe hook-block is indicated at 11 and has journaled therein Ythe usualsheave4 12 about which passes the cable 13 and also has secured thereto7the usual yload hook 14. vThe upper end of thishookW block is.r providedwith tapered sides indicatedfat 15 and tapered strengthening ribs 15'.'Vy y Intheoperation of this type ofhoisting mechanism, the hoist blocknear the ylimit of its.maximum hoistingumovement enters y the opening inthe frame and Icontacts .with autoL l however it will be seen that byreason of `the flared flange depending from the wall of the opening, inconnection with the tapered form of the upper end of the hook block, theY block is guided freely into the opening and danger of breakageeliminated.

The dead end of the cable 13 in the present construction is secured toone of the bolts which fastens the frame to the trolley, this bolt beingin the present case an eye bolt, indicatedy at 16, the eye being on theinterior of the frame and having the cables securely fastened thereto.The cable passes through the interior walls of the frame so as to bringit in line with the opening and has its other end tied to the drum. Asshown in Fig. 4 the dead end of the cable is so anchored that it hangsadjacent that end of the drum which receives the final coils or windingsof the cable. As a result of this arrangement that Q portion of thecable whichris being wound upon the final portion of the drum when thehook block is approaching the utmost limit of its hoisting movement,will stand at but a slight angle to the axis of the drum instead of at apronounced angle thereto as would be the case if the dead end of thecable was anchored at a lpoint midway the length of the drum. Thisarrangement, as previously explained obviates the annoyance of the coils$0 or windings of the cable tending to climb one I' upon the other andinsures that the cable follows the groove of the drum to the final limitof its winding movement.

Having thus described my invention, I t? claim:

v1. In a hoisting mechanism, a supporting ,frame located above the loadhaving a lower opening, a cable depending `from said frame through saidopening, a hook-block on said cable, means carried by the frame forhoisting i the cable and block, and guide means for said block arrangedabout said opening.

f2. In a hoisting mechanism, a supporting frame located above the loadhaving a lower @5 o nin a cable depending from said frame tllioug saidopening, a hook-block on said cable, means ycarried by the frame forhoisting the `cable and block,and guide means for said block arrangedabout said openiiig,said hook 50 block having a tapered upper end :tocooperate with said guide means.

f `3. In a hoisting'mechanism, a supporting frame located above the loadhaving a lower a cable depending from said frame 0 c a ai@ Praise@beek-blad? en Said cable, means carried bv the frame for hoisting thecable and block, and a flared depending flange about said opening.

4. In a hoisting mechanism, a supporting fra-me located above the loadhaving a lower openin a cable depending from said frame throng saidopening, a hook-block on said cable, means carried by the frame forhoisting the cable and block, and a flared depending flange about saidopening, said block having its upper end tapered to cooperate with saidflaring flange.

5. In a hoisting mechanism, a supporting frame located above the loadhaving a lower opening, a cable depending from said frame throughsaid-opening, a hook-block on said cable, and means carried by theframel for hoisting the cable block, said hook-block having a taperedupper end to cooperate with the Wall of said opening to guide the blocktherethrough.

6. In a hoisting mechanism, an over-head supporting frame, a windingdrum mounted thereon, a cable having its dead end anchored to said frameand its other end secured to said drum with the cable dependingtherefrom, the anchorage foi the dead end of the cable with said framebeing adjacent that end of the drum which receives the final coils ofthe cable and above the horizontal plane of the axis of the drum.

'f'.ln a hoisting mechanism, an overhead supporting frame, a windingdrum mounted thereon, a cable having its dead end anchored to said frameand its other end secured to said drum with the cable dependingtherefrom, a hook block on said cable, the anchorage for t-he dead endof the cable with said `frame being adjacent that end of the drum whichreceives the final coils of the cable and above the horizontal plane ofthe axis of the drum and in a vertical plane spaced from the drum adistance at least equal to the width of the hook block.

In testimony whereof, I have hereunto set my hand this 9th day of July,1929.

FRANK F. SEAMAN.

lao

